Dyes are coming to ESO in August. Currently, on the PTS you can preview how the dye system will work.To apply dyes to your armor, you must visit a Dye Station. There is at least one Dye Station per zone , located within a town. Once you apply color changes to your armor, the armor pieces bound to your character. You can use the Randomize button to apply a random assortment of colors to your armor based on those dyes you have unlocked. You can re-dye armor pieces as often as you like.All dyes are unlocked through the Achievement system.

Dye Stations

Dye Station Menu

Dye Station Tools
Dye:The Paint Brush allows you to apply color to a single color block.
Dye All:The Paint Can allows you to apply color to all three color blocks at once.
Clear Color:The Eraser allows you to clear the color from a single block.
Copy Color:The Eye Dropper allows you to copy a color from a block.
Set Fill:The Color Blocks allow you to use a Saved Set to fill the color blocks.
Saved Sets:To make it easier to apply color to multiple items, you can save up to four color sets.
Color Blocks:Each armor item has three color blocks that apply to different parts of the armor: Primary, Secondary, and Tertiary.

Here are examples of undyed heavy, medium, and light chest pieces.
Primary:Here are the same chest pieces with a primary dye.

Secondary:Here are the same chest pieces with a secondary dye.

Tertiary:Here are the same chest pieces with a tertiary dye.